Will it be 'Dexter' vs. Deb in season 6 finale?

"Dexter's" leading man is getting some serious competition in the form of sister Deb!

As lovable serial killer Dexter attempts to hunt down the Doomsday Killer to satisfy his Dark Passenger, Lt. Deb and her team at Miami Metro Homicide are closing in on Travis Marshall as well. Thanks to Professor Gellar's journal, the detectives have some thoughts about where to find the guy as he prepares to bring about the end of the world.

Check out this sneak peek (but stay away if your ears -- or office! -- are sensitive to adult language):

If you watched "Dexter" last week, you probably saw in the teaser that Travis also manages to get his hands on Dex's cute little mini-me, Harrison. This leads our hero to put himself in grave danger to save his son, even as his sister and co-workers are closing in on DDK. Looks like fans can prepare themselves for yet another bloody exciting season finale!